I’m working on a product which is running on Linux platform with the NTP version of 4.2.8 p12. I’ve seen more than 1,00,000 queries to DNS server in a fairly short period of time while date/time configuration to fetch from NTP host/IP. I examined the network traffic on my board with the latest firmware build and confirmed that there are excessive DNS packets.
There is 2 main observations as below:
- As long as the ntpd process is running, there are excessive DNS queries. Stopping ntpd appears to resolve the issue.
- Placing the IP instead of host name (ntp1.etn.com - in my case, to be precise) should stop the DNS query but issues is there with or without host name.